Medical device
A medical device which absorbs a difference in dimension between the members, can be applied to an existing device without generating a dead space in a flow path of a therapeutic substance when administrating the therapeutic substance, and is high in versatility. The medical device includes a feeding member, a connected member and a joint member, and the joint member includes an inner tapered portion and an outer tapered portion, the joint member is configured so that the tip end of the joint member is located on the inner tapered connecting portion when the joint member is connected to the hub.
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This application is the National Stage of International Application No. PCT/JP2014/084684 having International Filing Date, 26 Dec. 2014, which designated the United States of America, and which International Application was published under PCT Article 21 (2) as WO Publication No. 2015/099168 A1, and which claims priority from, and the benefit of, Japanese Application No. 2013-272932, filed on 27 Dec. 2013, the disclosures of which are incorporated herein by reference in their entireties.
BACKGROUND1. Field
The presently disclosed embodiment relates to a medical device for introducing a therapeutic substance into a body, particularly to a medical device to be used for operation using a catheter.
2. Brief Description of Related Developments
In a therapeutic method for introducing a therapeutic substance into a body, vascular embolization, for example, arterial embolization for treatment of hepatocellular carcinoma and the like has been used. In such treatment, in order to cut off feeding of nutrition to cancer cells, a blood vessel is clogged with an intravascular embolization substance to kill the cancer cells.
Introduction of such a therapeutic substance into a body cavity is performed by connecting a feeding member such as a syringe for feeding a therapeutic substance containing the therapeutic substance including an intravascular embolization substance with a catheter hub, and inserting the catheter in the blood vessel up to a vicinity of an affected part. The syringe and the catheter hub are generally connected by luer taper connection, and the syringe is inserted into the catheter hub to be fitted and fixed. As shown in
From the viewpoint of the mentioned problems, in a system for administration of a therapeutic substance into a body cavity including administration of a therapeutic substance comprising an intravascular embolization substance into an affected part for cancer treatment, various attempts have been performed in order to eliminate a dead space resulting from luer taper connection. For example, in Japanese Patent No. 2002-503991, there is disclosed a syringe 200 having, at its distal end, a tapered outer wall adapted to an inner wall shape of a micro catheter luer hub 201. In Japanese Patent No. 4357067, there is disclosed, as shown in
However, in the structure of Japanese Patent No. 2002-503991, unless both of the syringe 200 and the micro catheter luer hub 201 are produced precisely, there is a high possibility that a dead space is generated due to a difference in dimension between the distal end of the syringe 200 and the inner wall of the catheter luer hub 201. Also, in the structure of Japanese Patent No. 2002-503991, it cannot be used in combination with other syringe and micro catheter luer hub having different diameter, length or the like and there is no versatility.
In the case of Japanese Patent No. 4357067, the filling body 303 needs to be put in an inner cavity of the connector 300 beforehand and therefore, is hardly applied to an existing device. In addition, when the male adaptor 302 is pushed into the connected portion 301, the filling body 303 may be deformed and the flow channel 304 may also be deformed. If the flow channel 304 is deformed, a dead space such as a step may be produced in the flow channel 304 and in the worst case, the flow channel 304 may be blocked.
In the light of the above-mentioned problems, an object of the presently disclosed embodiment is to provide a medical device which absorbs a difference in dimension between the members, inhibits a dead space from being generated in a flow path of a therapeutic substance when the therapeutic substance is administrated, can be applied to an existing device and has high versatility.
The medical device of the presently disclosed embodiment is a medical device comprising a feeding member comprising a tubular body portion being capable of containing a therapeutic substance to be fed into a body cavity and a tubular connecting portion provided at one end of the body portion and having a male luer tapered portion and an opening provided at a distal end of the male luer tapered portion to feed the therapeutic substance contained in the body portion; a connected member having a flow channel through which the therapeutic substance fed from the feeding member passes and provided with a hub having an inner tapered connecting portion including a female luer tapered portion; and a joint member connected to the tubular connecting portion of the feeding member and the hub of the connected member and having a communication channel for communicating the tubular connecting portion of the feeding member with the flow channel of the connected member, and the device is characterized in that the joint member comprises an inner tapered portion for connecting to the male luer tapered portion, an outer tapered portion for connecting to the female luer tapered portion, and an opening at the side of the connected member located at a tip end of the outer tapered portion for feeding the therapeutic substance from the feeding member to the connected member, and when the joint member is connected to the hub, the joint member is configured so as to allow the inner end portion of the opening at the side of the connected member to be disposed in proximity with and along the tapered surface of the inner tapered connecting portion so that the tip end of the joint member is located on the inner tapered connecting portion.
It is preferable that the joint member has an abutting face to which an end face of the tubular connecting portion abuts when the tubular connecting portion is pressed into the joint member along the inner tapered portion, and the inner surface of the communication channel and the inner surface of the tubular connecting portion have substantially the same diameter at a connecting place.
It is preferable that the joint member is formed from a resin or a metal.
It is also preferable that a lock mechanism is provided to the feeding member and/or the joint member, and when the feeding member and the joint member are locked by means of the lock mechanism, the end face of the tubular connecting portion abuts onto the abutting face of the joint member.
Further it is preferable that the feeding member is a syringe, a three-way cock or a four-way cock, and the connected member is a catheter.
Furthermore it is preferable that the therapeutic substance is an intravascular embolization substance, the medical device is a medical device for vascular embolization for injecting the intravascular embolization substance into a body cavity, and the catheter is configured to be capable of feeding from the distal end of the catheter a mixed liquid contained in the syringe and comprising the intravascular embolization substance and a medicine.
According to the medical device of the presently disclosed embodiment, a difference in dimension between the members can be absorbed, generation of a dead space in a flow path of a therapeutic substance can be inhibited when administrating the therapeutic substance, the device can be applied to an existing device, and versatility is high.
A medical device of the presently disclosed embodiment is then explained below in detail in reference to the attached drawings.
The medical device of the presently disclosed embodiment is used to form a continuous path by jointing a plurality of members when feeding a therapeutic substance into a body cavity such as a blood vessel or an organ and feed the therapeutic substance into the body cavity through the continuous path. In aspects described below, explanation is made using a medical device for embolization as an example. However, the medical device is not limited to one for embolization as far as it is a medical device feeding a therapeutic substance into a body cavity and having effects described below. Further, with respect to a therapeutic substance to be fed to a body cavity, in aspects described below, explanation is made using a therapeutic substance comprising resin particles being an example of an intravascular embolization substance. However, the therapeutic substance is not limited particularly as far as it is one having effects described below, and it is possible to use a therapeutic substance depending on a symptom requiring medical treatment.
As shown in
As shown in
As shown in an aspect described below, for example, a syringe is used as the feeding member 2. The feeding member 2 is not limited to a syringe as far as it has the body portion 21 and the tubular connecting portion 22 and can be connected to the joint member 4 by luer taper connection. The feeding member 2 may be, for example, other medical tools such as a three-way cock and a four-way cock, or other medical tools such as a transfusion bag having a flexible body portion. Further, while in
The connected member 3 has a flow channel 31 through which the therapeutic substance fed from the feeding member 2 passes, and a hub 33 having an inner tapered connecting portion 32 including a female luer tapered portion 32a (see
In a conventional medical device, for example, in the case of connecting a syringe to a catheter hub, as shown in
The joint member 4 is, as shown in
Furthermore, as shown in
In the medical device 1 of the presently disclosed embodiment, the joint member 4 is, as described above, provided with the inner tapered portion 42 and the outer tapered portion 43, and the tip end T of the joint member 4 is disposed on the inner tapered connecting portion 32. Therefore, a dimensional difference between the members can be absorbed by the joint member 4. Further, generation of a dead space on a flow path of the therapeutic substance and retention of the therapeutic substance on the dead space can be inhibited. Thereby, it is possible to administrate an accurate amount of the therapeutic substance to a patient. The use of the joint member 4 is very significant, especially, from the viewpoint that an end face 22c where a dead space is easily generated is formed at a free end of the feeding member 2 such as a syringe generally used for medical application or from the viewpoint that it is difficult to modify the shapes of the feeding member 2 and the connected member 3 due to a problem on cost and standard thereof. In the medical device 1 of the presently disclosed embodiment, it is not necessary to use a special feeding member 2 and connected member 3 by using the joint member 4, and the structures of the feeding member 2 and the connected member 3 need not be modified for inhibiting a dead space. Therefore, the medical device 1 can be applied to existing feeding member 2 and connected member 3. Accordingly, not only a problem with a dead space can be inhibited but also the medical device 1 provides a very high versatility and low cost. While in the drawings, the joint member 4 is shown as a connector, it is not limited thereto, and may be a three-way cock. Further, the joint member 4 may have a tubular portion extending from the outer tapered portion to the tip end side thereof and having, at the end, an opening at the side of the connected portion.
As shown in
In this aspect, as shown in
It should be noted that the shape of the joint member 4 is not limited to a substantially truncated cone shape as shown in
The inner tapered portion 42 and the male luer tapered portion 22a may be connected via luer taper connection so that the feeding member 2 can be pulled out easily from the joint member 4 when the feeding member 2 is pressed into the joint member 4. There may be a clearance between the end face 22c of the feeding member 2 and the end wall 44, if the clearance does not cause a problem with retention of the therapeutic substance when the therapeutic substance is fed from the feeding member 2 to the joint member 4 side. In such aspect, a part of the inner tapered portion 42 may be a connecting region coming into contact with the male luer tapered portion 22a, and the remaining part of the inner tapered portion 42 may be a non-connecting region where the inner surface side tapered portion 42 does not come into contact with the male luer tapered portion 22a. For example, by setting a region of the joint member 4 at the end wall 44 side to be the connecting region with the male luer tapered portion 22a, and setting a region at the feeding member 2 side from the connecting region to be the non-connecting region having an inner diameter larger than the outer diameter of the male luer tapered portion 22a, it is possible to retain the contacting area between the inner tapered portion 42 and the male luer tapered portion 22a to an extent necessary for obtaining an engaging force enabling the feeding process of the therapeutic substance from the feeding member 2. Therefore, the engaging force between the inner tapered portion 42 and the male luer tapered portion 22a due to the contact does not become too strong, and when the feeding member 2 is pressed into the joint member 4, it may be easy to move the joint member 4 to a position where the end face 22c of the tubular connecting portion 22 abuts onto the end wall 44, and it may be easy to remove the feeding member 2 from the joint member 4.
As mentioned above, since the shape of the joint member 4 is not limited particularly, the portion of the joint member 4 irrelevant to the luer taper connection may have a shape different from that shown in
Next, one aspect of the presently disclosed embodiment is then explained by referring to
As shown in
The connection between the joint member 4 and the catheter as the connected member 3 is performed by inserting the joint member 4 into the hub 33 of the catheter. When the joint member 4 is inserted into the hub 33, the outer tapered portion 43 of the joint member 4 is connected to the inner tapered connecting portion 32 of the hub 33 of the catheter by luer taper connection, thereby connecting the joint member 4 to the catheter. In this aspect, while the joint member 4 is connected to the catheter only by luer taper connection, it should be noted that the connection may be performed strongly by means of a lock mechanism in the same manner as in the connection of the joint member 4 to the syringe.
When the syringe is connected to the catheter via the joint member 4 and a catheter shaft 34 of the catheter is inserted into a body cavity, it is possible to feed the mixed liquid comprising the resin particles and the medicine from the distal end of the catheter into the body cavity by pushing the plunger 23 of the syringe. While generation of a dead space between the end face 22c of the tubular connecting portion 22 and the end wall 44 of the joint member 4 is inhibited as mentioned above, generation of a dead space between the tip end T of the joint member 4 and the inner tapered connecting portion 32 of the hub 33 of the catheter is also inhibited as mentioned above. Therefore, the resin particles contained in the mixed liquid are inhibited from remaining at the connecting places between the joint member 4 and the syringe and between the joint member 4 and the catheter, and the mixed liquid is fed smoothly into the body cavity via the catheter shaft 34. Accordingly, a precise amount of resin particles necessary for treatment can be introduced into the affected part. Further, it becomes easy to clean each member since retention of the resin particles at the connecting places caused by a dead space is inhibited.
Furthermore, generation of a dead space can be inhibited by using existing syringe and catheter and connecting the joint member 4 adapted to the taper angles of the syringe and catheter. Therefore, the joint member 4 has high versatility and assures easy handling.
Next, other aspects are explained by referring to
In the aspects shown in
The second aspect shown in
In the second aspect, the end wall 44 is formed in a tapered shape, and the communication channel 41 is configured so as to be in parallel with the insertion axis X and has the same diameter along the insertion axis X. However, unless the feeding of the therapeutic substance from the feeding channel 22e to the communication channel 41 is inhibited, the end wall 44 may be formed substantially vertical to the insertion axis X, or the communication channel 41 may be formed in a shape tapered toward the connected member 3 side. In addition, with respect to the end wall 44 and the inner surface 41a, a flow rate confirming portion formed in a shape tapered toward the connected member 3 side may be provided to enable the flow rate of the therapeutic substance fed from the feeding member 2 to be confirmed visually. The dimension of flow rate confirming portion is not limited particularly as long as the flow rate of the therapeutic substance can be confirmed. A position of the flow rate confirming portion with respect to the communication channel 41, an angle and a length of a slope with respect to the axis of the communication channel 41, a range of an inner diameter and the number of flow rate confirming portions to be provided can be set appropriately according to kind of a therapeutic substance. For example, the flow rate confirming portion with a slope having a given angle (e.g., 30°) with respect to the axis of the communication channel 41 and having a given length may be provided between the vertical end face 22c and the communication channel 41, or the end wall 44 may be formed in a tapered shape to be used as the flow rate confirming portion. In the case where the flow rate confirming portion is provided, the inner surface 41a of the communication path 41 may be either in parallel with the axis of the communication channel 41 or in a tapered shape with respect to the axis of the communication channel 41. By the flow rate confirming portion, the inflow of the therapeutic substance is easily confirmed. It is preferable that the angles of the end wall 44 and the communication channel 41 with respect to the axis of the communication channel 41 are those which enable retention of the therapeutic substance to be inhibited and are tapered toward the connected member 3 side.
The third aspect shown in
In the third aspect, the end wall 44 is formed substantially vertical to the insertion axis X, and the communication channel 41 is formed in a tapered shape. However, unless the feeding of the therapeutic substance from the feeding channel 22e to the communication channel 41 is inhibited, the end wall 44 may be formed in a tapered shape toward the connected member 3 and the communication channel 41 may be formed so as to be in parallel with the insertion axis X and has the same diameter along the insertion axis X. Further, the both of the end wall 44 and the communication channel 41 may be formed in a tapered shape. In that case, it is preferable that the end wall 44 and the communication channel 41 are formed such that the angle between the end wall 44 and the insertion axis X is larger than the angle between the communication channel 41 and the insertion axis X.
EXPLANATION OF SYMBOLS
-
- 1 medical device
- 2 feeding member
- 21 body portion
- 22 tubular connecting portion
- 22a male luer tapered portion
- 22b opening
- 22c end face of a tubular connecting portion
- 22d inner surface of a tubular connecting portion
- 22e feeding channel
- 23 plunger
- 24 connecting portion
- 3 connected member
- 31 flow channel
- 32 inner tapered connecting portion
- 32a female luer tapered portion
- 32b inner tapered surface
- 33 hub
- 34 catheter shaft
- 4 joint member
- 41 communication channel
- 41a inner surface of a communication channel
- 42 inner tapered portion
- 43 outer tapered portion
- 44 end wall
- 45 opening at the side of a connected member
- 45a inner end portion of an opening at the side of a connected
- member
- 46 locking-part forming portion
- 5 lock mechanism
- 51 locking part
- 52 locked part
- C connecting place
- E end of an inner tapered connecting portion on a flow channel
- side
- T tip end of a joint member
- X insertion axis
Claims
1. A medical device comprising:
- a feeding member comprising a tubular body portion being capable of containing a therapeutic substance to be fed into a body cavity and a tubular connecting portion provided at one end of the body portion and having a male luer tapered portion and an opening provided at a distal end of the male luer tapered portion to feed the therapeutic substance contained in the body portion;
- a connected member having a flow channel through which the therapeutic substance fed from the feeding member passes and provided with a hub having an inner tapered connecting portion including a female luer tapered portion; and
- a joint member connected to the tubular connecting portion of the feeding member and the hub of the connected member and having a communication channel for communicating the tubular connecting portion of the feeding member with the flow channel of the connected member,
- wherein the joint member comprises an inner tapered portion for connecting to the male luer tapered portion, an outer tapered portion for connecting to the female luer tapered portion, and an opening at a side of the connected member for feeding the therapeutic substance from the feeding member to the connected member,
- the tubular connecting portion has an end face being vertical to an axial direction of the tubular connecting portion at a free end of the tubular connecting portion,
- the joint member has an abutting face connecting an end portion of the inner tapered portion at a connected member side to an end portion of an inner surface of the communication channel at a feeding member side,
- the end face of the tubular connecting portion is in surface contact with the abutting face so that both the end face and abutting face are in surface contact throughout each face when the tubular connecting portion is pressed into the joint member along the inner tapered portion, and the inner surface of the communication channel and an inner surface of the tubular connecting portion have substantially the same diameter at a connecting place,
- the outer tapered portion of the point member terminates at a tip end, the tip end including the opening at the side of the connected member, an outer most edge of the tip end forms an inner end portion of the opening of the joint member and is disposed so that the outer most edge of the tip end and the inner end portion of the opening are seated against an inner tapered surface of the female luer tapered portion of the inner tapered connecting portion so as to form a stepless interface between the inner end portion of the opening of the joint member and an end of the inner tapered connecting portion, and
- when the joint member is connected to the hub, the tip end is located at a position apart from the end of the inner tapered connecting portion on the flow channel side toward the feeding member side.
2. The medical device of claim 1, wherein the joint member is formed from a resin or a metal.
3. The medical device of claim 1, wherein a lock mechanism is provided to the feeding member and/or the joint member, and when the feeding member and the joint member are locked by means of the lock mechanism, the end face of the tubular connecting portion abuts onto the abutting face of the joint member.
4. The medical device of claim 1, wherein the feeding member is a syringe, a three-way cock or a four-way cock, and the connected member is a catheter.
5. The medical device of claim 4, wherein the therapeutic substance is an intravascular embolization substance, the medical device is a medical device for vascular embolization for injecting the intravascular embolization substance into a body cavity, and the catheter is configured to be capable of feeding from the distal end of the catheter a mixed liquid contained in the syringe and comprising the intravascular embolization substance and a medicine.
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Type: Grant
Filed: Dec 26, 2014
Date of Patent: Jan 29, 2019
Patent Publication Number: 20160317799
Assignee: HI-LEX CORPORATION
Inventors: Hidekazu Tohse (Hyogo), Junji Fujita (Hyogo), Akihiro Ametani (Hyogo), Akihisa Ishii (Tokyo), Shinichi Hori (Osaka), Atsushi Hori (Osaka)
Primary Examiner: Nathan R Price
Assistant Examiner: Anh Bui
Application Number: 15/107,975
International Classification: A61M 39/10 (20060101); A61M 5/14 (20060101); A61M 5/145 (20060101); A61M 25/00 (20060101); A61M 5/34 (20060101); A61B 17/12 (20060101);